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I have an old 6-cup moka pot (bialetti) that I recently replaced the filter and the rubber gasket (bialetti brand), however the extraction time seems a bit long, bubbles to soon(almost immediately) and sputters out- resulting in that bitter over-extracted taste. Strangely, it did work fine just a few times after I replaced the gasket but soon after the sputtering started. Thinking that maybe the rubber gasket was faulty, I replaced it again, but still the same problem. In the past, this moka pot has produced good brews with a nice uniform flow.

Could it be something is off with the safety valve i.e. not sealing enough and allowing pressure to escape?

By the way, I also have a 3-cup moka pot one that I have tested with the same process (pre-heating water, grind level, grind amount, medium heat) and the results are consistently good.

  • There is a reddit thread that deals with a similar problem reddit.com/r/Coffee/comments/3au98b/…. To summarize it: Do not temp the grounds when filling, clean the pot, make sure it's sealed properly and use low heat. On their homepage Bialetti also mentions that high heat can cause problems similar to what you describe. They also say Select burner size to fit bottom of pot. For gas stovetop, make sure the flame is not larger than bottom of pot. The flame should not come around the sides of the pot. Maybe these help? – schvaba Feb 14 '17 at 14:00
  • As mentioned above, I use medium heat and the sputtering still occurs. I have also used medium low heat and never high heat. I also never tamp. I've read most of the proposed solutions and moka pot tutorials out there. – caveman39 Feb 20 '17 at 17:09
  • Then I'd ask your pot dealer for advice or replacement. They probably encountered similar cases in the past. – schvaba Feb 27 '17 at 11:27
  • I'm in a similar position, and can't ask my dealer as @schvaba suggests as it's a vintage bialetti (60s I think) bought somewhere in Italy. I'm wondering if the gasket needs to be oiled, but first I'm giving everything a good clean (normally it just gets a rinse to keep it nicely seasoned). Rather than ask a duplicate question I've taken the liberty of editing yours to bump it. – Chris H Feb 19 '18 at 21:10
  • @ChrisH I'd rather add comments instead of editing the original question. Somehow, we don't know if this was originally the case at first. Still, yours is very similar to the original case. – MTSan Feb 19 '18 at 23:36
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Folks - please be aware that there are at least two different thicknesses (not talking diameter) for Moka pots. I know that Bialetti makes gaskets in at least 2 different thicknesses. If your Moka pot design needs a thicker one and the replacement is the thinner one, the seal will never be what it needs to be and the flow of coffee will be affected. Hope this helps.

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It sounds like you know your Moka pot well, and it is true that it is an easy way to get deliciously strong coffee. That being said, it can also be very nuanced in how it works. First, your new gasket should seal perfectly well and as long as there is no sputtering from the screw joint, it is good.

Sputtering means that you are forcing too much steam too quickly through the grounds and into the pot. Try using a high heat to get the coffee flowing, then adjust the heat to keep an even flow into the top chamber. It's possible that with a bad seal, extra pressure was being release from the screw joint and now it is all being directed through the "tower".

Maybe try just keeping it cranked on heat for the whole brew, then low for the whole brew, then mix in between. That's probably the best way to troubleshoot this

Hope this helps!

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I've had this problem for years, every time I replace the rubber gasket on my 6-cup Bialetti. But I finally found the answer: in my case, what I had to do was replace the metal funnel.

It's very tempting (or was for me anyhow) to empty the spent grounds after brewing by tapping the funnel against the edge of a sink or trash can. However, this can cause the funnel to deform slightly, creating small gaps between the sides of the funnel and the sides of the pot, which then prevents a good seal and causes the sputtering (even when screwed down tightly). So my advice: get a new funnel, and don't empty the grounds by tapping it against anything.

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